Positioning the Housed Amplifier
Positioning the Housed Amplifier
Place the case so that the ventilation airflow paths are not blocked.
Troubleshooting
Troubleshooting
The following table lists the main causes of abnormal operation and the corrective measures required, as
well as the protective circuit operation in each case.
Front
Front
Less than 10cm
( X ) ( X )
12
M-1500/2000
POWER AMPLIFIER
Indicator Probable Cause Remedy Protection Circuit
CLIP indicator
lights.
–40dB indicator
lights only.
There is a short at a
speaker terminal,
amplifier terminal, or
wire.
The amplifier load is
excessive.
DC voltage of +/–2V
or greater was generated
in the power amplifier’s
output circuit.
Consult your dealer. The relay operates to
protect the speaker
system.
The heat sink
temperature has
exceeded 100˚C.
Locate and correct the
cause of the short.
Use a speaker system
with an impedance of at
least 4Ω (stereo) or 8Ω
(bridge).
Check the amplifier
ventilation conditions
and take appropriate
measures to improve
airflow around the
amplifier.
The PC limiter circuit
operates to protect the
power transistors.
Same as above.
The thermal protection
circuit operates to
protect the power
transistors.
PROTECTION
indicator lights.
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